Homogeneous mixtures are those whose particles vary in terms of substance, are too small to be seen and are evenly mixed.Heterogeneous mixtures are those whose particles vary in composition, are large enough to be seen and are not evenly mixed.
The Distinguishing Characteristics That Set These Similar Things Apart. Ph.D., Biomedical Sciences, University of Tennessee at Knoxville. Dr. Helmenstine holds a Ph.D. She has taught science courses at the high school, college, and graduate levels. Solutions, suspensions, colloids, and other dispersions are similar but have characteristics that set each one apart from the others. A solution is a homogeneous mixture of two or more components. The components of a solution are atoms, ions, or molecules, making them 10 -9 m or smaller in diameter. The particles in suspensions are larger than those found in solutions. Components of a suspension can be evenly distributed by mechanical means, like by shaking the contents but the components will eventually settle out. Particles intermediate in size between those found in solutions and suspensions can be mixed in such a way that they remain evenly distributed without settling out. These particles range in size from 10 -8 to 10 -6 m in size and are termed colloidal particles or colloids. A colloidal dispersion consists of colloids in a dispersing medium. Liquids, solids, and gasses all may be mixed to form colloidal dispersions. ![]() Colloids can be distinguished from solutions using the Tyndall effect. A beam of light passing through a true solution, such as air, is not visible. Light passing through a colloidal dispersion, such as smoky or foggy air, will be reflected by the larger particles and the light beam will be visible. ThoughtCo, Aug. 27, 2020, thoughtco.comsolutions-suspensions-colloids-and-dispersions-608177.
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